$49x^2+9y^2+294x-180y-423=0$
$1+\frac{2\cos x\left(1+\cos x\right)}{\sin^2x}=\frac{1+\cos x}{1-\cos x}$
$x+5\le-2$
$\sqrt[6]{3^3}$
$2log\:\left(x+3\right)=0$
$xy'+2y=x^2+x$
$343a^3b^3-b^3$
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